December weather in Key West, FL
The average temperature in Key West in December is 71.5°F (66.0°F–76.9°F). Average precipitation: 2.22 inches.
December is a winter month in Key West, and is cooler than the annual average of 77.4°F. Daily temperatures swing about 10.9°F between overnight low and afternoon high. Expect about 7 days with precipitation. Daylight averages about 10h 29m. For travel, December is one of the best months of the year to visit.
Avg High
76.9°F
Avg Low
66.0°F
Precipitation
2.22 in
Daylight
10h 29m
December records in Key West
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 84.9°F (2015) | 62.1°F (2020) | 0.96 in (2016) |
| December 2 | 84.9°F (2023) | 62.1°F (2020) | 0.48 in (2015) |
| December 3 | 84.0°F (2018) | 59.0°F (2024) | 1.21 in (2015) |
| December 4 | 84.9°F (2018) | 59.0°F (2024) | 2.24 in (2015) |
| December 5 | 84.9°F (2025) | 62.1°F (2019) | 0.77 in (2012) |
| December 6 | 84.0°F (2016) | 57.0°F (2019) | 0.15 in (2012) |
| December 7 | 86.0°F (2025) | 62.1°F (2019) | 1.28 in (2020) |
| December 8 | 84.0°F (2025) | 62.1°F (2020) | 0.66 in (2025) |
| December 9 | 82.9°F (2019) | 60.1°F (2020) | 1.15 in (2017) |
| December 10 | 84.0°F (2013) | 55.0°F (2014) | 0.04 in (2024) |
| December 11 | 84.0°F (2019) | 53.1°F (2014) | 0.38 in (2013) |
| December 12 | 82.9°F (2015) | 53.1°F (2017) | 0.26 in (2019) |
| December 13 | 84.9°F (2021) | 55.9°F (2017) | 0.45 in (2025) |
| December 14 | 84.0°F (2018) | 51.1°F (2017) | 0.16 in (2023) |
| December 15 | 82.9°F (2013) | 55.9°F (2017) | 1.00 in (2023) |
| December 16 | 84.0°F (2015) | 60.1°F (2014) | 2.18 in (2023) |
| December 17 | 84.0°F (2015) | 60.1°F (2014) | 1.10 in (2022) |
| December 18 | 84.0°F (2016) | 60.1°F (2014) | 0.77 in (2019) |
| December 19 | 86.0°F (2016) | 61.0°F (2023) | 0.18 in (2019) |
| December 20 | 82.9°F (2018) | 62.1°F (2023) | 2.25 in (2022) |
| December 21 | 82.9°F (2013) | 61.0°F (2024) | 0.38 in (2021) |
| December 22 | 82.9°F (2013) | 55.9°F (2012) | 3.90 in (2019) |
| December 23 | 84.0°F (2014) | 52.0°F (2012) | 0.31 in (2022) |
| December 24 | 84.0°F (2015) | 55.0°F (2022) | 1.50 in (2014) |
| December 25 | 82.9°F (2015) | 54.0°F (2022) | 1.41 in (2023) |
| December 26 | 84.0°F (2015) | 51.1°F (2020) | 0.93 in (2016) |
| December 27 | 84.0°F (2015) | 48.9°F (2020) | 0.84 in (2024) |
| December 28 | 84.0°F (2015) | 61.0°F (2023) | 0.85 in (2023) |
| December 29 | 84.9°F (2015) | 60.1°F (2023) | 1.26 in (2024) |
| December 30 | 84.0°F (2015) | 57.0°F (2023) | 0.09 in (2020) |
| December 31 | 84.9°F (2015) | 55.0°F (2023) | 0.00 in (2012) |